31330021201 has 4 divisors (see below), whose sum is σ = 31330920292. Its totient is φ = 31329122112.

The previous prime is 31330021199. The next prime is 31330021223. The reversal of 31330021201 is 10212003313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9765392400 + 21564628801 = 98820^2 + 146849^2 .

It is a cyclic number.

It is not a de Polignac number, because 31330021201 - 2¹ = 31330021199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31330021001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 395076 + ... + 467701.

It is an arithmetic number, because the mean of its divisors is an integer number (7832730073).

Almost surely, 2^31330021201 is an apocalyptic number.

It is an amenable number.

31330021201 is a deficient number, since it is larger than the sum of its proper divisors (899091).

31330021201 is an equidigital number, since it uses as much as digits as its factorization.

31330021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899090.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31330021201 its reverse (10212003313), we get a palindrome (41542024514).

The spelling of 31330021201 in words is "thirty-one billion, three hundred thirty million, twenty-one thousand, two hundred one".